<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // var num = 1

    // while(num <= 10) {
    //   console.log(num)

    //   num++
    // }

    // var sum = 0
    // var i = 1
    // while(i <= 100) {
    //   sum += i
    //   i++
    // }
    // console.log(sum)


    var res = prompt('吃饭了吗')
    while(res !== '吃了') {
      res = prompt('吃饭了吗')
    }




  </script>
</body>
</html>